So at my place of work, we have Play Network CDs... basically they are CDs with a text file and a binary file that hold up to 4 hrs of music on one cd.

The Text file is certainly some sort of index file, and the Binary is the audio data.

I am trying to figure out what sort of Compression is used, and what kind of scheme is used so i can maybe make my own CD so we dont have to listen to the crappy Music they give us.

So far all i have figured out is how to make a CD that has expired able to be played after its expiration date (effectively changing the expiration date on the CD) by editing the text file on the cd.

I am wondering if anyone would be interested in taking a look at the files... i could arrange a transfer of the index file and hte binary data to be sent to whoever would like to take a look.